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1. 发明授权

US09894619B2 Base station 有权
公开(公告)号：US09894619B2
公开(公告)日：2018-02-13
申请号：US15123314
申请日：2015-02-19
申请人： NTT DOCOMO, INC.
发明人： Yusuke Ohwatari , Kazuaki Takeda , Yousuke Sano , Yukihiko Okumura
IPC分类号： H04W52/14 , H04W52/32 , H04L27/26 , H04L5/00
摘要： Some OFDM symbols transmitted temporally continuously by a base station include data signals that are not orthogonal to each other and are directed to user devices. A reference signal is arranged in the OFDM symbols temporally intermittently. The base station determines, according to reception qualities at user devices, downlink data signal transmission powers for transmitting downlink data signals. The base station reduces a downlink data signal transmission power in an OFDM symbol in which the reference signal is arranged to be lower than a downlink data signal transmission power in an OFDM symbol in which the reference signal is not arranged. The base station determines a downlink reference signal transmission power to be higher than the downlink data signal transmission power of a data signal in the OFDM symbol in which the reference signal is not arranged.

2. 发明授权

US09814054B2 Base station, user apparatus and interference reduction method 有权
公开(公告)号：US09814054B2
公开(公告)日：2017-11-07
申请号：US14905002
申请日：2014-06-16
申请人： NTT DOCOMO, INC.
发明人： Yusuke Ohwatari , Kazuaki Takeda , Satoshi Nagata , Yousuke Sano
IPC分类号： H04W72/08 , H04L5/00 , H04W72/04 , H04W92/20
CPC分类号： H04W72/082 , H04L5/0032 , H04L5/0051 , H04L5/0073 , H04W72/042 , H04W92/20
摘要： A base station connected to a user apparatus in a radio communication system is provided. The base station includes a receiving unit configured to receive from an interference base station first control information which is used by the user apparatus for reducing an uplink interference signal from one or more cells formed by the interference base station or from another user apparatus, a generation unit configured to generate second control information based on one or more pieces of the first control information received from the interference base station, and a transmitting unit configured to transmit the second control information to the user apparatus by a downlink control signal.

3. 发明申请

US20160183199A1 RADIO COMMUNICATION SYSTEM AND USER DEVICE 有权
标题翻译：无线电通信系统和用户设备
公开(公告)号：US20160183199A1
公开(公告)日：2016-06-23
申请号：US14906323
申请日：2014-07-22
申请人： NTT DOCOMO, INC.
发明人： Kazuaki Takeda , Yusuke Ohwatari , Yousuke Sano , Yukihiko Okumura , Yoshihisa Kishiyama
IPC分类号： H04W52/24 , H04W52/28
CPC分类号： H04W52/243 , H04B1/71072 , H04J11/004 , H04J11/005 , H04W52/28 , H04W52/283
摘要： A user device receives, from a base station, a radio signal in which non-orthogonal signals are mixed. The user device recognizes, based on information transmitted from the base station, a parameter associated with the location of the user device. When the user device is at the edge of the cell area of the base station, a demodulator of the user device demodulates, as a signal directed to the user device, the radio signal in which an interference signal component has been suppressed by an interference rejection combining processor of the user device and a non-orthogonal signal canceller of the user device does not operate. When the user device is within the cell area and is not at the edge of the cell area, until the demodulator demodulates the signal directed to the user device, the interference rejection combining processor suppresses an interference signal component in a non-orthogonal signal outputted from the non-orthogonal signal canceller and the demodulator demodulates the non-orthogonal signal in which the interference signal component has been suppressed by the interference rejection combining processor.
摘要翻译：用户设备从基站接收其中混合非正交信号的无线电信号。用户设备基于从基站发送的信息识别与用户设备的位置相关联的参数。当用户设备处于基站的小区区域的边缘时，用户设备的解调器作为指向用户设备的信号解调干扰信号分量已经被干扰抑制抑制的无线电信号用户装置的组合处理器和用户装置的非正交信号消除器不起作用。当用户设备在小区区域内并且不在小区区域的边缘时，直到解调器解调指向用户设备的信号，干扰抑制组合处理器抑制从正交信号中输出的非正交信号中的干扰信号分量非正交信号消除器和解调器解调干扰信号分量已被干扰抑制组合处理器抑制的非正交信号。

4. 发明授权

US09357504B2 Radio communication system and radio base station 有权
标题翻译：无线电通信系统和无线电基站
公开(公告)号：US09357504B2
公开(公告)日：2016-05-31
申请号：US14405261
申请日：2013-05-21
申请人： NTT DOCOMO, INC.
发明人： Yusuke Ohwatari , Akihito Morimoto , Yukihiko Okumura
IPC分类号： H04W52/24 , H04W16/14 , H04W24/02 , H04W16/08 , H04W16/32 , H04W52/14 , H04W52/38 , H04W52/40
CPC分类号： H04W52/243 , H04W16/08 , H04W16/14 , H04W16/32 , H04W24/02 , H04W52/143 , H04W52/244 , H04W52/38 , H04W52/40
摘要： In a radio communication system in which a high-power base station and a low-power base station collaborate for inter-cell interference control, the downlink transmission power at the high-power base station is suitably controlled. The high-power base station executes wireless transmission to the user terminals using resources that are the same as resources used by the low-power radio base station. A transmission power controller of the radio base station uses a first downlink transmission power at first resources and uses a lower second downlink transmission power at second resources. The transmission power controller adjusts the second downlink transmission power in accordance with the number of user terminals capable of executing interference rejection combining, the downlink traffic amount for user terminals capable of executing interference rejection combining, or the number of downlink resource blocks allocated to user terminals capable of executing interference rejection combining.
摘要翻译：在大功率基站和低功率基站协作用于小区间干扰控制的无线通信系统中，适当地控制高功率基站的下行链路发送功率。高功率基站使用与低功率无线基站所使用的资源相同的资源，向用户终端执行无线传输。无线基站的发送功率控制器以第一资源使用第一下行链路发送功率，并以第二资源使用较低的第二下行链路发送功率。发送功率控制器根据能够执行干扰抑制组合的用户终端的数量，能够执行干扰抑制组合的用户终端的下行业务量，或分配给用户终端的下行链路资源块的数量来调整第二下行链路发送功率能够执行干扰抑制组合。

5. 发明申请

US20180167888A1 USER TERMINAL 审中-公开
公开(公告)号：US20180167888A1
公开(公告)日：2018-06-14
申请号：US15894285
申请日：2018-02-12
申请人： NTT DOCOMO, INC.
发明人： Yusuke Ohwatari , Kazuaki Takeda , Yousuke Sano , Yukihiko Okumura
IPC分类号： H04W52/14 , H04W52/32 , H04L5/00 , H04L27/26
CPC分类号： H04W52/143 , H04L5/0007 , H04L5/005 , H04L27/2602 , H04L27/2626 , H04W52/16 , H04W52/241 , H04W52/247 , H04W52/322 , H04W52/325 , H04W52/44
摘要： A user device includes a receiver configured to receive information indicating a ratio between a downlink data signal transmission power for an OFDM (orthogonal frequency division multiplexing) symbol in which a CRS (cell-specific reference signal) is not arranged and a downlink data signal transmission power for an OFDM symbol in which a CRS is arranged; and a controller configured to calculate a downlink data signal transmission power based on the information.

6. 发明申请

US20170208552A1 BASE STATION AND USER DEVICE 审中-公开
公开(公告)号：US20170208552A1
公开(公告)日：2017-07-20
申请号：US15326593
申请日：2015-07-14
申请人： NTT DOCOMO, INC.
发明人： Yusuke Ohwatari , Kazuaki Takeda , Yousuke Sano , Yukihiko Okumura
IPC分类号： H04W52/14
CPC分类号： H04W52/143 , H04J11/004 , H04J11/005 , H04W52/243 , H04W72/0466 , H04W72/0473
摘要： A base station, according to received qualities at user devices, allocates a downlink transmission power to each user device. The base station transmits a mixed data signal in which data signals mutually not orthogonal and each addressed to a corresponding user device are mixed. Control signals are transmitted to user devices to enable each user device to decode a data signal addressed to the user device using a control signal corresponding to the user device. Each control signal is scrambled by the identifier of the corresponding user device. A control signal for a first user device to which a first data signal is addressed includes information indicating the identifier of a second user device to which a second data signal mixed with the first data signal is addressed. The first user device is thus enabled to descramble a control signal for the second user device.

7. 发明授权

US09667309B2 User apparatus, base station, successive interference canceling process method, and successive interference canceling control method 有权
公开(公告)号：US09667309B2
公开(公告)日：2017-05-30
申请号：US14910866
申请日：2014-06-27
申请人： NTT DOCOMO, INC.
发明人： Yousuke Sano , Yusuke Ohwatari , Kazuaki Takeda , Satoshi Nagata
IPC分类号： H04B1/7117 , H04B1/7107 , H04W16/28 , H04J11/00
CPC分类号： H04B1/71072 , H04J11/0043 , H04W16/28
摘要： A user apparatus for use in a radio communication system, including: an successive interference cancelling reception unit configured to obtain a desired signal by successively canceling an interference signal that becomes interference to the desired signal from a received signal that the user apparatus receives; and an ordering determination unit configured to determine an order of interference signals to be successively canceled by the successive interference cancelling reception unit, wherein the ordering determination unit determines the order based on reception quality for each interference signal.

8. 发明申请

US20160191115A1 USER APPARATUS, BASE STATION, SUCCESSIVE INTERFERENCE CANCELING PROCESS METHOD, AND SUCCESSIVE INTERFERENCE CANCELING CONTROL METHOD 有权
标题翻译：用户装置，基站，连续干扰消除处理方法和连续干扰消除控制方法
公开(公告)号：US20160191115A1
公开(公告)日：2016-06-30
申请号：US14910866
申请日：2014-06-27
申请人： NTT DOCOMO, INC.
发明人： Yousuke Sano , Yusuke Ohwatari , Kazuaki Takeda , Satoshi Nagata
IPC分类号： H04B1/7107 , H04J11/00
CPC分类号： H04B1/71072 , H04J11/0043 , H04W16/28
摘要： A user apparatus for use in a radio communication system, including: an successive interference cancelling reception unit configured to obtain a desired signal by successively canceling an interference signal that becomes interference to the desired signal from a received signal that the user apparatus receives; and an ordering determination unit configured to determine an order of interference signals to be successively canceled by the successive interference cancelling reception unit, wherein the ordering determination unit determines the order based on reception quality for each interference signal.
摘要翻译：一种用于无线通信系统的用户装置，包括：连续干扰消除接收单元，被配置为通过从所述用户装置接收到的接收信号中依次取消对所述期望信号的干扰的干扰信号来获得期望信号; 以及排序确定单元，被配置为确定由所述连续干扰消除接收单元连续取消的干扰信号的顺序，其中所述排序确定单元基于每个干扰信号的接收质量来确定所述顺序。

9. 发明申请

US20160165616A1 BASE STATION, USER APPARATUS AND INTERFERENCE REDUCTION METHOD 有权
标题翻译：基站，用户装置和干扰减少方法
公开(公告)号：US20160165616A1
公开(公告)日：2016-06-09
申请号：US14905002
申请日：2014-06-16
申请人： NTT DOCOMO, INC.
发明人： Yusuke Ohwatari , Kazuaki Takeda , Satoshi Nagata , Yousuke Sano
IPC分类号： H04W72/08 , H04W72/04 , H04L5/00
CPC分类号： H04W72/082 , H04L5/0032 , H04L5/0051 , H04L5/0073 , H04W72/042 , H04W92/20
摘要： A base station connected to a user apparatus in a radio communication system is provided. The base station includes a receiving unit configured to receive from an interference base station first control information which is used by the user apparatus for reducing an uplink interference signal from one or more cells formed by the interference base station or from another user apparatus, a generation unit configured to generate second control information based on one or more pieces of the first control information received from the interference base station, and a transmitting unit configured to transmit the second control information to the user apparatus by a downlink control signal.
摘要翻译：提供了连接到无线通信系统中的用户装置的基站。基站包括：接收单元，被配置为从干扰基站接收第一控制信息，该控制信息由用户装置用于减少由干扰基站或另一用户装置形成的一个或多个小区的上行链路干扰信号;生成被配置为基于从干扰基站接收的一个或多个第一控制信息生成第二控制信息的单元，以及被配置为通过下行链路控制信号向用户装置发送第二控制信息的发送单元。

10. 发明申请

US20150358103A1 MOBILE COMMUNICATION TERMINAL 有权
标题翻译：移动通信终端
公开(公告)号：US20150358103A1
公开(公告)日：2015-12-10
申请号：US14760573
申请日：2013-09-26
申请人： NTT DOCOMO, INC.
发明人： Yusuke Ohwatari , Yousuke Sano , Yukihiko Okumura
IPC分类号： H04J11/00 , H04W72/04 , H04L5/00 , H04B17/336 , H04W72/08
CPC分类号： H04J11/0056 , H04B7/061 , H04B7/0814 , H04B7/0854 , H04B17/336 , H04J11/00 , H04J11/005 , H04L5/0023 , H04L5/0073 , H04W16/28 , H04W72/0413 , H04W72/082
摘要： A mobile communication terminal calculates an interference rejection combining reception weight matrix so as to reduce interference with a desired beam by another beam, in which the desired beam is a beam of radio waves transmitted from a desired base station. The mobile communication terminal estimates an interference and noise power expected when the IRC is implemented based on the interference rejection combining reception weight matrix and calculates a signal-to-interference-plus-noise ratio expected when the IRC is implemented based on the interference and noise power. The mobile communication terminal measures or calculates received signal qualities relative to radio waves received from a plurality of base stations, to compensate for the signal-to-interference-plus-noise ratio or the interference and noise power.
摘要翻译：移动通信终端计算干扰抑制组合接收权重矩阵，以便通过另一个射束减少对期望的波束的干扰，其中期望的波束是从期望的基站发送的无线电波束。移动通信终端基于干扰抑制组合接收加权矩阵来估计实现IRC时的干扰和噪声功率，并且基于干扰和噪声来计算当实施IRC时期望的信号与干扰之间的信噪比功率。移动通信终端相对于从多个基站接收到的无线电波测量或计算接收的信号质量，以补偿信号与干扰之间的信噪比或干扰噪声功率。

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